package test;

public class test1 {
    public static void main(String[] args) {
        double v = Math.log(1 / 7.0) / Math.log(2);
        System.out.println(v);
        double ceil = Math.ceil(v);
        System.out.println("ceil"+ceil);
        int v2= (int) ceil;
        System.out.println(v2);
    }
}
